Presumably to cleanse the palate before a raft of films from around the world arrives, SIFF Cinema is spending the week screening old greats—including, tonight, The Apartment, Billy Wilder's 1960 masterpiece about an insurance company employee constantly having to vacate his New York City apartment so high-class executives can use it to carry on affairs with misty-eyed beauties. It's in black and white and the textures are gorgeous—everything (even Jack Lemmon and Shirley MacLaine) looks to be made of marzipan, pewter, light boxes, and chalk. (SIFF Cinema, 321 Mercer St, 633-7151. 7:30 pm, $10.)